A photovoltaic connection circuit board and a photovoltaic inverter

Abstract

The application discloses a photovoltaic connection circuit board and a photovoltaic inverter, wherein the photovoltaic connection circuit board comprises a board body, photovoltaic connectors and plug-in devices; for any photovoltaic connector, the plug-in device closest to the pin of the photovoltaic connector exposed on the second surface of the board body and located upstream of the pin along the arrangement direction is combined with the photovoltaic connector to form a layout unit; for any layout unit, the plug-in device and the pin of the photovoltaic connector exposed on the second surface of the board body are staggered with each other in the projection shape on the projection surface perpendicular to the arrangement direction; the photovoltaic connector and the plug-in device are welded to the board body through wave soldering; and the arrangement direction is opposite to the movement direction of the board body when wave soldering is performed. The photovoltaic connection circuit board can improve the problem of insecure welding of the pin of the photovoltaic connector.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic technology, in particular to a photovoltaic connection circuit board and a photovoltaic inverter. BACKGROUND

[0002] The photovoltaic inverter can convert the direct current from the photovoltaic module into alternating current and deliver the alternating current to the power grid or load. The photovoltaic module includes a plurality of photovoltaic strings, each of which includes a plurality of photovoltaic panels connected in series, the photovoltaic panels being used to convert light energy into electrical energy, and each photovoltaic panel generates direct current. In order to access the direct current of the photovoltaic module, the photovoltaic inverter is generally provided with a photovoltaic connection circuit board for accessing the direct current. The circuit board is mainly provided with a plurality of photovoltaic connectors, the photovoltaic connectors are connected with the output cable of the photovoltaic module, and the electrical energy is delivered to the DC-DC converter and the DC-AC converter of the photovoltaic inverter through the photovoltaic connection circuit board. On the above-mentioned photovoltaic connection circuit board, the photovoltaic connectors are generally welded on the front surface of the board body, and a plurality of capacitors and output terminals for suppressing electromagnetic interference are welded on the back surface of the board body. The photovoltaic connectors, capacitors and output terminals need to be welded to the board body of the circuit board by wave soldering. Since these components are distributed on both surfaces of the board body, wave soldering needs to be performed twice. It is found in the welding process that the pins of some photovoltaic connectors are not firmly welded. SUMMARY

[0003] The present application aims to overcome the above-mentioned defects or problems in the background art and provide a photovoltaic connection circuit board and a photovoltaic inverter, which can improve the problem of the pins of the photovoltaic connectors not being firmly welded in the existing photovoltaic connection circuit board.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] Technical solution one: a photovoltaic connection circuit board, comprising a board body and a plurality of photovoltaic connectors, the photovoltaic connectors being arranged on a first surface of the board body, the pins of the photovoltaic connectors being exposed on a second surface of the board body through the board body, and further comprising a plurality of plug-in devices arranged on the second surface of the board body; defining the plug-in device closest to the pin of any photovoltaic connector exposed on the second surface of the board body and located upstream of the pin in the arrangement direction as a plug-in device combined with the photovoltaic connector to form a layout unit; for any layout unit, the projection shape of the plug-in device and the pin of the photovoltaic connector exposed on the second surface of the board body is staggered in the projection plane perpendicular to the arrangement direction; the photovoltaic connectors and plug-in devices are welded to the board body by wave soldering; and the arrangement direction is opposite to the movement direction of the board body when wave soldering is performed.

[0006] The second technical solution based on the first technical solution: for any of the layout units, the plug-in device and the corresponding photovoltaic connector exposed to the pin projection shape of the second surface of the board do not overlap.

[0007] The third technical solution based on the second technical solution: in the first direction perpendicular to the arrangement direction and located on the board, two layout units are arranged in sequence to form a layout module; for any of the layout modules, the two photovoltaic connectors exposed to the pins on the second surface of the board are arranged on both sides in the first direction, and the two plug-in devices are located between the two pins in the first direction.

[0008] The fourth technical solution based on the third technical solution: in any of the layout modules, the two plug-in devices are in close proximity to each other in the first direction, so as to be away from the pins exposed to the photovoltaic connectors in the layout unit to which they belong.

[0009] The fifth technical solution based on the fourth technical solution: the types of the plug-in devices include wiring terminals for external output and capacitor modules for interference suppression; the capacitor module includes a first capacitor and a second capacitor electrically connected by an electrical connection line on the board.

[0010] The sixth technical solution based on the fifth technical solution: define the layout unit including the type of plug-in device as a wiring terminal as a first layout unit, and the layout unit including the type of plug-in device as a capacitor module as a second layout unit; there is at least one first layout unit, which has a corresponding second layout unit, and the first capacitor and the second capacitor in the second layout unit are arranged on both sides of the first layout unit in the second direction; the second direction is parallel to the arrangement direction or the movement direction of the board.

[0011] The seventh technical solution based on the sixth technical solution: in the first layout unit having a corresponding second layout unit, the pins of the wiring terminal are provided with two groups on the opposite side, and the two groups of pins are arranged in the first direction; in the second layout unit corresponding to the first layout unit, the electrical connection line of the first capacitor and the second capacitor in the board passes between the two groups of pins of the wiring terminal of the first layout unit.

[0012] The eighth technical solution based on the seventh technical solution: the board includes at least three stacked layers, each of which is used to form an electrical connection line; in the first layout unit and the second layout unit having a corresponding relationship, the circuit trace between the first capacitor and the second capacitor of the capacitor module is located on the inner layer of the board, the pin welding position of the wiring terminal is located on the outer layer, and the part of the pin of the wiring terminal penetrating the inner layer is not electrically connected with the inner layer.

[0013] Based on the technical solution eight, the ninth technical solution is that each layer of the plate body is provided with a wiring through hole for the pin of the wiring terminal to pass through, and only the hole in the outer layer plate part of the plate body is provided with a welding ring for welding the pin of the wiring terminal to the layer plate.

[0014] In addition, the present application also provides a tenth technical solution: a photovoltaic inverter, comprising a shell, which further comprises the photovoltaic connection circuit board according to any one of the first to ninth technical solutions, the plate body of the photovoltaic connection circuit board is located in the shell, and the photovoltaic connector of the photovoltaic connection circuit board extends out of the shell.

[0015] From the above description of the present application, compared with the prior art, the present application has the following beneficial effects:

[0016] The first technical solution provides a photovoltaic connection circuit board, which comprises a plate body, a plurality of photovoltaic connectors and a plurality of plug-in devices, wherein the first surface of the plate body is provided with the photovoltaic connectors, the second surface of the plate body is provided with the plug-in devices, the pins of the photovoltaic connectors pass through the plate body and are exposed on the second surface of the plate body, and the photovoltaic connectors and the plug-in devices are welded to the plate body by wave soldering; during welding, the plate body moves along a predetermined movement direction, so that the solder liquid can flood the pin positions of each device that needs to be welded. However, after welding is completed, the pins of the photovoltaic connectors exposed on the second surface of the plate body are prone to loose welding. After careful analysis, the inventors found that the pins of the photovoltaic connectors are relatively close to the adjacent plug-in devices, and the plug-in devices need to be covered with a cover during welding to avoid the influence of the solder liquid on these plug-in devices. However, the cover is relatively large in size, so that when the solder liquid flows through the position of the cover, the solder liquid is blocked by the cover, thereby reducing the flow of the solder liquid at the back of the cover relative to the movement direction of the plate body. The pins of the photovoltaic connectors cannot contact enough solder liquid, resulting in loose welding of the photovoltaic connectors.

[0017] Therefore, the inventors creatively adjust the position of the pins of the photovoltaic connectors on the plate body and the position of the adjacent plug-in devices to improve the problem of loose welding of the pins of the photovoltaic connectors. Among them, define the plug-in device that is closest to the pin of any photovoltaic connector exposed on the second surface of the plate body and is located at the upstream position of the pin along the arrangement direction as a combination with the photovoltaic connector to form a layout unit. In any one layout unit, the projection shape of the plug-in device and the pin of the photovoltaic connector exposed on the second surface of the plate body is staggered on the projection plane perpendicular to the arrangement direction. The position of the staggered setting makes the position of the pins of the photovoltaic connectors staggered with the position of the plug-in devices at the part where the flow of the solder liquid at the back of the plug-in devices is reduced. The pins of the photovoltaic connectors can be flooded with enough solder liquid, and the pins of the photovoltaic connectors can be more firmly welded to the plate body.

[0018] In the second technical solution, the pin projection shapes of the plug-in device and the photovoltaic connector on the projection surface do not overlap, that is, the photovoltaic connector completely avoids the position of the plug-in device. In this way, no matter how thick the solder liquid is, when flowing from the side of the plug-in device, it will inevitably cover the pins of the corresponding photovoltaic connector, thereby ensuring the firmness of the soldering of the pins of the photovoltaic connector to the board.

[0019] In the third technical solution, the two layout units form a layout module, the pins of the photovoltaic connectors in the layout module are located on both sides of the first direction, and the plug-in device is located between the pins of the two photovoltaic connectors. The pins of the two photovoltaic connectors are arranged far enough to avoid the influence of the firmness of the soldering of the pins of the photovoltaic connectors by the plug-in device adjacent to other layout units, and to facilitate the layout of the circuit and the device of the circuit board. The photovoltaic connectors have sufficient distance between them, which also facilitates the external power input wiring of the photovoltaic connectors.

[0020] In the fourth technical solution, the two plug-in devices in the layout module are arranged closely, thereby being far away from the pins of the photovoltaic connectors in the respective layout units, and the influence of the plug-in devices on the firmness of the soldering of the pins of the photovoltaic connectors is reduced as much as possible.

[0021] In the fifth technical solution, the plug-in device includes a wiring terminal for external output and a capacitor module for suppressing interference, wherein the capacitor module includes a first capacitor and a second capacitor. The electrical energy connected by the photovoltaic connector can be output to other electrical equipment through the wiring terminal, and the first capacitor and the second capacitor in the capacitor module can suppress electromagnetic interference between electrical devices on the circuit board.

[0022] In the sixth technical solution, the first capacitor and the second capacitor in the second layout unit corresponding to the first layout unit are arranged at two side positions, respectively. Compared with close arrangement of the first capacitor and the second capacitor, the sixth technical solution can ensure that the first capacitor and the second capacitor have sufficient safety distance, meet the safety requirements, and at the same time, the first capacitor and the second capacitor each occupy a smaller area compared with close arrangement, which can reduce the influence on the firmness of the soldering of the pins of the photovoltaic connector.

[0023] In the seventh technical solution, the first capacitor and the second capacitor need to be electrically connected through the electric connection line in the plate body, and the first capacitor and the second capacitor are separated by the terminal, and the pin of the terminal affects the arrangement of the electric connection line between the first capacitor and the second capacitor. Therefore, the positions of the two groups of pins of the terminal are adjusted, and the two groups of pins are arranged in the first direction. Thus, a space for wiring is formed between the two groups of pins, and the electric connection line of the first capacitor and the second capacitor in the plate body can pass through the space between the two groups of pins, thereby meeting the requirement that the pins of the terminal and the corresponding photovoltaic connector are staggered, and the electrical connection between the first capacitor and the second capacitor is not affected, and the layout of the overall electrical device is very compact.

[0024] In the eighth technical solution, the plate body is provided with a plurality of layers, the wiring of the first capacitor and the second capacitor is located in the inner layer, and the pin welding position of the terminal is welded only on the outer layer and is not electrically connected with the inner layer. In this way, the pin of the terminal only has a corresponding electric connection line on the outer layer, and does not affect the electric connection line of the first capacitor and the second capacitor in the inner layer.

[0025] In the ninth technical solution, among the terminal through holes of the plate body, only the terminal through hole located in the outer layer is provided with a welding ring for welding the pin of the terminal to the layer, and the inner layer is not provided with a welding ring. Thus, even if the pin of the terminal passes through the inner layer, since the inner layer is not provided with a welding ring connected with the pin of the terminal, the pin of the terminal has a long enough distance from the electric connection line between the first capacitor and the second capacitor in the inner layer, thereby meeting the safety requirement.

[0026] In the tenth technical solution, a photovoltaic inverter is provided, which adopts the photovoltaic connection circuit board described above, can access photovoltaic electric energy, and outputs the photovoltaic electric energy to other circuit components in the photovoltaic inverter through the terminal. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 The layout schematic diagram of the photovoltaic connection circuit board provided by the embodiment of the present application is shown in the following figure.

[0029] Figure 2 The connection schematic diagram of the terminal in the plate body is shown in the following figure. Figure 1 ​

[0030] Main reference signs:

[0031] Panel body 1; photovoltaic pin 2; wiring terminal 3; capacitor module 4; first capacitor 5; second capacitor 6; layout module 7; first layout unit 8; second layout unit 9; wiring pin 10; layer plate 11; welding ring 12; grounding terminal 13. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as exclusion of other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the claims, the specification, and the above drawings of the present application, unless otherwise explicitly limited, the terms such as "first", "second", or "third" are used only to distinguish different objects, and are not used to describe a particular order.

[0034] In the claims, the specification, and the above drawings of the present application, unless otherwise explicitly limited, for orientation words, such as the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "back", "left", "right", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation and position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, so it cannot be understood as limiting the specific protection scope of the present application.

[0035] In the claims, the specification, and the above drawings of the present application, unless otherwise explicitly limited, such as the terms "fixedly connected" or "fixedly connected", should be understood broadly, that is, any connection mode between the two without displacement relationship and relative rotation relationship, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.

[0036] In the claims, the specification, and the above drawings of the present application, the terms "include", "have" and their variants are intended to mean "include but not limited to".

[0037] Reference Figure 1The photovoltaic connection circuit board can be arranged in a photovoltaic inverter, and is used for accessing direct current from a photovoltaic module. The photovoltaic connection circuit board can play the functions of current collection, overcurrent protection, reverse connection protection, voltage monitoring and control, lightning protection, filtering and the like, and is a key component in the photovoltaic inverter, thereby ensuring stable, safe and efficient operation of the system.

[0038] The photovoltaic connection circuit board comprises a board body 1 and a plurality of photovoltaic connectors. The photovoltaic connectors are arranged on a first surface of the board body 1, and pins of the photovoltaic connectors, hereinafter referred to as photovoltaic pins 2, pass through the board body 1 and are exposed on a second surface of the board body 1. In addition, the photovoltaic connection circuit board further comprises a plurality of plug-in devices arranged on the second surface of the board body 1. The first surface and the second surface of the board body 1 correspond to the front surface and the back surface of the board body 1.

[0039] The photovoltaic connector is a key device in the photovoltaic connection circuit board, and can provide reliable and efficient electrical connection between the photovoltaic module and the photovoltaic inverter. The plug-in device is an electrical element welded on the board body 1 through the pins. In the embodiment, the types of the plug-in device include a wiring terminal for external output and a capacitor module 4 for interference suppression. In the case where the type of the plug-in device is the capacitor module 4, the capacitor module 4 comprises a first capacitor 5 and a second capacitor 6 electrically connected through an electrical connection line on the board body 1.

[0040] The firmness of the installation between the photovoltaic connector and the board body 1 directly affects whether the photovoltaic connector can reliably transmit electric energy under the harsh conditions of the outdoors. The inventor found that the existing photovoltaic connector has the problem of insecure welding when being welded to the board body 1 by wave soldering. After detailed analysis and investigation, the inventor found that the photovoltaic connector and the plug-in device are usually located on the two surfaces of the board body, so the welding process is divided into two wave solderings for the two surfaces of the board body respectively. Usually, the photovoltaic connector is the second wave soldering. When welding the photovoltaic connector, the plug-in device needs to be covered with a cover first to avoid the influence of the soldering liquid on the plug-in device. However, the cover is relatively large in size, so that when the soldering liquid flows through the position of the cover, the soldering liquid is blocked by the cover, thereby reducing the flow of the soldering liquid at the back of the cover relative to the movement direction of the board body 1. The pins of the photovoltaic connector cannot contact enough soldering liquid, resulting in insecure welding of the photovoltaic connector.

[0041] To this end, the photovoltaic connection circuit board provided by the embodiment improves the above problems by adjusting the positions of the plug-in device and the photovoltaic pin 2. The plug-in device closest to the pin of the photovoltaic connector exposed on the second surface of the board body 1 and located upstream of the pin in the arrangement direction forms a layout unit in combination with the photovoltaic connector; for any layout unit, the plug-in device and the pin of the photovoltaic connector exposed on the second surface of the board body 1 are staggered in the projection shape on the projection plane perpendicular to the arrangement direction; the photovoltaic connector and the plug-in device are welded to the board body 1 by wave soldering; and the arrangement direction is opposite to the movement direction of the board body 1 when wave soldering is performed. In this way, the position of the plug-in device where the solder flow at the back is reduced is staggered with the position of the pin of the photovoltaic connector, the pin of the photovoltaic connector can be submerged in a sufficient amount of solder, and the pin of the photovoltaic connector can be more firmly welded to the board body 1.

[0042] Specifically, refer to Figure 1 , Figure 1 The above movement direction and arrangement direction are shown, and it is easy to understand that when the plug-in device and the photovoltaic pin 2 on the board body 1 are welded by wave soldering, the board body 1 needs to move in the movement direction, the flow direction of the solder is opposite to the movement direction of the board body 1, that is, the flow direction of the solder is consistent with the arrangement direction. It should be noted that the above movement direction of the board body 1 and the arrangement direction both have a single direction of pointing, Figure 1 In addition, the first direction and the second direction perpendicular to each other are marked in the above, the second direction is parallel to the arrangement direction or the movement direction of the board body 1, and the first direction and the second direction are both bidirectional.

[0043] Refer to Figure 1The photovoltaic pin 2 is matched with a nearby plug-in device to define a layout unit, and the device layout of the whole circuit board is adjusted in the layout unit. In each layout unit, the projection shape of the plug-in device on the projection plane perpendicular to the arrangement direction is staggered with the projection shape of the corresponding photovoltaic pin 2. The staggering refers to that the projection shapes of the two have partial overlap or no overlap, and the case that the projection shape of the plug-in device completely covers the projection shape of the photovoltaic pin 2 is excluded. It should be noted that the projection shape of the photovoltaic pin 2 is usually smaller than the projection shape of the plug-in device, and only in this case the plug-in device has a greater impact on the welding firmness of the photovoltaic pin 2. In addition, it should be understood that even if the projection shapes of the photovoltaic pin 2 and the plug-in device have partial overlap, the degree of the partial overlap must meet the requirement that the plug-in device does not affect the solder liquid to fully cover the photovoltaic pin 2, and the degree is obviously adjusted according to the actual situation according to the size of the circuit device. However, it is obvious that if the projection shapes of the two have no overlap, the impact of the plug-in device on the welding firmness of the photovoltaic pin 2 will be reduced to the minimum.

[0044] As a preferred embodiment, refer to Figure 1 When there is enough space position on the circuit board, it is obviously better to set the projection shapes of the plug-in device and the photovoltaic pin 2 to be non-overlapping.

[0045] Refer to Figure 1 In a first direction perpendicular to the arrangement direction and located on the board body 1, two layout units are arranged in sequence to form a layout module 7. For any layout module 7, the two photovoltaic connectors are exposed on the board body 1 second surface, and the pins are arranged on both sides in the first direction, and the two plug-in devices are located between the two pins in the first direction. Specifically, the two layout units can be matched to form a layout module, and the layout module is arranged on the board body 1 by the two layout units in the first direction. Generally, the types of the plug-in devices of the two layout units in a layout module are the same, for example Figure 1 In the above embodiment, the plug-in devices in the left layout module 7 are all capacitor modules 4, and the plug-in devices in the middle layout module 7 are all wiring terminals 3. This design can facilitate the wiring of the electrical connection line in the board body 1, and also make the device layout on the board body 1 more regular. At the same time, by setting the pins of the two photovoltaic connectors far enough, the welding firmness of the pins of the photovoltaic connector can be avoided from being affected by the plug-in devices belonging to other layout units, and the circuit and device layout of the circuit board is facilitated. The photovoltaic connectors have enough distance, and the electrical energy input wiring of the photovoltaic connector is facilitated.

[0046] In any of the layout modules 7, two plug-in devices are arranged close to each other along the first direction to expose the pins of the photovoltaic connectors in the respective layout unit to the second surface of the board 1. By arranging the two plug-in devices close to each other in the layout module 7 to expose the pins of the photovoltaic connectors in the respective layout unit, the influence of the plug-in devices on the welding firmness of the pins of the photovoltaic connectors can be reduced as much as possible.

[0047] The layout unit including the plug-in device of the type of the wiring terminal 3 is defined as the first layout unit 8, and the layout unit including the plug-in device of the type of the capacitor module 4 is defined as the second layout unit 9. There is at least one first layout unit 8, and there is a second layout unit 9 corresponding to the first layout unit 8. The first capacitor 5 and the second capacitor 6 in the second layout unit 9 are arranged on the two sides of the first layout unit 8 along the second direction, respectively. The second direction is parallel to the arrangement direction or the movement direction of the board 1. Specifically, refer to Figure 1 , Figure 1 The layout unit in the middle includes the plug-in device of the type of the wiring terminal 3, and thus belongs to the first layout unit 8. The layout units on the two sides include the plug-in device of the type of the capacitor module 4, and thus belong to the second layout unit 9. The second layout unit 9 can include the first capacitor 5 or the second capacitor 6. In fact, the first capacitor 5 and the second capacitor 6 are completely the same in composition, and each includes a large capacitor with a large capacitance and a small capacitor with a small capacitance connected in parallel. Refer to Figure 1 The dashed line connecting the photovoltaic pin 2, the capacitor module 4, and the wiring terminal 3 in the middle of FIG. 1 represents the electrical connection line on the board 1. As can be seen, after the photovoltaic pin 2 is connected to the first capacitor 5 on the left, the first capacitor 5 is connected to the second capacitor 6 on the right, and the second capacitor 6 is connected to the grounding terminal 13, so that the capacitor module 4 plays a role in preventing electromagnetic interference. Specifically, the first capacitor 5 and the second capacitor 6 described above are Y capacitors for suppressing electromagnetic interference, and they are usually required to have sufficient spacing in the circuit board structure to meet safety requirements. Therefore, by arranging the first capacitor 5 and the second capacitor 6 in the second layout unit 9 corresponding to the first layout unit 8 on the two sides, respectively, compared to arranging the first capacitor 5 and the second capacitor 6 close to each other, the first capacitor 5 and the second capacitor 6 can have sufficient safety distance between them to meet safety requirements, and at the same time, the first capacitor 5 and the second capacitor 6 each occupy a smaller area than when arranged close to each other, which can reduce the influence on the welding firmness of the pins of the photovoltaic connectors.

[0048] At the same time, refer to Figure 1In the first layout unit 8 corresponding to the second layout unit 9, the two groups of pins are arranged in the first direction and are spaced apart. In the second layout unit 9 corresponding to the first layout unit 8, the electrical connection lines of the first capacitor 5 and the second capacitor 6 in the board 1 pass between the two groups of pins of the terminal 3. Specifically, the terminal 3 includes two groups of pins, each group of pins includes two independent pins, and the two groups of pins are arranged on the two sides of the terminal 3. In this embodiment, the two groups of pins are arranged in the first direction, so that a large enough gap is formed between the two groups of pins, and the gap can be used for the electrical connection lines of the first capacitor 5 and the second capacitor 6 in the board 1 to pass through. Obviously, if the two groups of pins are arranged in the second direction, the two pins in each group of pins are too close to form a space for the electrical connection lines to pass through, so the two terminals 3 in the same layout module 7 can only be spaced apart by a sufficient distance to allow the electrical connection lines to pass through, which shortens the distance between the terminal 3 and the photovoltaic pin 2 and increases the influence of the terminal 3 on the welding firmness of the photovoltaic pin 2. Therefore, the positions of the two groups of pins of the terminal 3 are adjusted so that the two groups of pins are arranged in the first direction. In this way, a space for wiring is formed between the two groups of pins, and the electrical connection lines of the first capacitor 5 and the second capacitor 6 in the board 1 can pass between the two groups of pins, thereby meeting the requirement that the terminal 3 and the corresponding photovoltaic connector pin are staggered, without affecting the electrical connection between the first capacitor 5 and the second capacitor 6, and the overall electrical device layout is very compact. In this embodiment, the terminal 3 and the two corresponding photovoltaic pins 2 are electrically connected through the electrical connection lines in the board 1, and the specific corresponding relationship can be adjusted according to actual conditions.

[0049] Referring to Figure 2 The board 1 includes at least three stacked layers 11, each of which is used to form an electrical connection line. In the first layout unit 8 and the second layout unit 9 having a corresponding relationship, the circuit wiring between the first capacitor 5 and the second capacitor 6 of the capacitor module 4 is located on the inner layer 11 of the board 1, the pin welding position of the terminal 3 is located on the outer layer 11, and the part of the terminal 3 penetrating the inner layer 11 is not electrically connected to the inner layer 11. Specifically, each layer 11 of the board 1 is provided with a terminal penetration hole for the pin of the terminal 3 to pass through, and only the hole in the outer layer 11 of the board 1 is provided with a welding ring 12 for welding the pin of the terminal 3 to the layer 11.

[0050] In the embodiment, the plate body 1 comprises four laminated layers 11, and the wire through holes are arranged on the layers 11 corresponding to the pin of the wire terminal 3, that is, the wire pin 10, and the wire pin 10 passes through the wire through hole and is welded with the layer 11 to form an electrical connection. Through the above arrangement, the pin of the wire terminal 3 only has a corresponding electrical connection circuit on the outer layer 11, and does not affect the electrical connection circuit of the first capacitor 5 and the second capacitor 6 on the inner layer 11. Among them, only the wire through hole of the outer layer 11 is provided with a welding ring 12 for welding the pin of the wire terminal 3 to the layer 11, and the inner layer 11 is not provided with the welding ring 12, so that even if the pin of the wire terminal 3 passes through the inner layer 11, since the inner layer 11 does not have the welding ring 12 connected with the pin of the wire terminal 3, the pin of the wire terminal 3 has a long enough distance from the electrical connection circuit between the first capacitor 5 and the second capacitor 6 on the inner layer 11, thereby meeting the requirements of safety regulations.

[0051] The embodiment of the present application also provides a photovoltaic inverter, which comprises a shell and the photovoltaic circuit connecting plate provided by the above embodiment, the plate body 1 of the photovoltaic connecting circuit plate is located in the shell, and the photovoltaic connector of the photovoltaic connecting circuit plate extends out of the shell. The photovoltaic inverter can access photovoltaic electric energy and output the photovoltaic electric energy to other circuit components in the photovoltaic inverter through the wire terminal 3.

[0052] The description of the above specification and embodiments is used to explain the protection scope of the present application, but does not constitute a limitation on the protection scope of the present application. Through the inspiration of the present application or the above embodiment, the modification, equivalent replacement or other improvement of the embodiment of the present application or one part of the technical features can be obtained by the ordinary skilled in the art combining with the common knowledge, the ordinary technical knowledge in the art and / or the prior art through logical analysis, reasoning or limited test, and should be included in the protection scope of the present application.

Claims

1. A photovoltaic connection circuit board, comprising a board body (1) and a plurality of photovoltaic connectors, the photovoltaic connectors being arranged on a first surface of the board body (1), and the pins of the photovoltaic connectors being exposed on a second surface of the board body (1) through the board body (1), characterized in that, a plurality of plug-in devices are arranged on the second surface of the board body (1); a plug-in device and a photovoltaic connector exposed on the second surface of the board body (1) form a layout unit; the projection shapes of the plug-in device and the pin of the photovoltaic connector exposed on the second surface of the board body (1) are staggered in a projection plane perpendicular to the arrangement direction; the photovoltaic connectors and the plug-in devices are soldered to the board body (1) by wave soldering; the arrangement direction is opposite to the movement direction of the board body (1) during wave soldering; the projection shapes of the plug-in device and the pin of the photovoltaic connector exposed on the second surface of the board body (1) do not overlap in the projection plane; two layout units are arranged in sequence to form a layout module (7) in a first direction perpendicular to the arrangement direction; the pins of the two photovoltaic connectors exposed on the second surface of the board body (1) are arranged at two side positions in the first direction, respectively; and the two plug-in devices are arranged between the two pins in the first direction. In any layout module (7), the two plug-in devices are close to each other in the first direction to be away from the pins of the photovoltaic connectors exposed on the second surface of the board body (1) in the layout units to which the two plug-in devices belong. The types of the plug-in devices include a terminal (3) for external output and a capacitor module (4) for interference suppression; the capacitor module (4) comprises a first capacitor (5) and a second capacitor (6) electrically connected by an electrical connection line on the board body (1). The layout unit comprising the terminal (3) is a first layout unit (8), and the layout unit comprising the capacitor module (4) is a second layout unit (9); at least one first layout unit (8) has a corresponding second layout unit (9); the first capacitor (5) and the second capacitor (6) in the second layout unit (9) are arranged at two side positions of the first layout unit (8) in a second direction; the second direction is parallel to the arrangement direction or the movement direction of the board body (1). In the first layout unit (8) having the corresponding second layout unit (9), two groups of pins of the terminal (3) are arranged at two side positions in the first direction; the electrical connection line of the first capacitor (5) and the second capacitor (6) in the second layout unit (9) passes through between the two groups of pins of the terminal (3) in the first layout unit (8). ​ 2. A photovoltaic connection circuit board as claimed in claim 1, characterized in that ​ 3. A photovoltaic connection circuit board as claimed in claim 2, characterized in that ​ 4. A photovoltaic connection circuit board as claimed in claim 3, characterized in that the definition ​ 5. A photovoltaic connection circuit board as claimed in claim 4, characterized in that ​ 6. A photovoltaic connection circuit board as claimed in claim 5, characterized in that The plate body (1) comprises at least three laminated layer plates (11), each of which is used to form an electric connection circuit; in the first and second layout units (8, 9) having a corresponding relationship, the circuit wiring between the first and second capacitor components (5, 6) of the capacitor module (4) is located on the inner layer plate (11) of the plate body (1), the pin welding position of the terminal (3) is located on the outer layer plate (11), and the part of the pin of the terminal (3) penetrating through the inner layer plate (11) is not electrically connected with the inner layer plate (11).

7. A photovoltaic connection circuit board as claimed in claim 6, characterized in that Each layer plate (11) of the plate body (1) is provided with a terminal penetrating hole for the pin of the terminal (3) to pass through, and only the hole in the outer layer plate (11) part of the plate body (1) is provided with a welding ring (12) for welding the pin of the terminal (3) to the layer plate (11).

8. A photovoltaic inverter comprising a housing, characterized in that Further comprising the photovoltaic connection circuit board according to any one of claims 1-7, wherein the plate body (1) of the photovoltaic connection circuit board is located in the shell, and the photovoltaic connector of the photovoltaic connection circuit board extends out of the shell.

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